Once a giant pumpkin is too big to lift, growers estimate its weight the official weigh-off way: three tape measurements over the top (circumference, side-to-side and stem-to-blossom) are added together and looked up on the Great Pumpkin Commonwealth chart. Hollow dots are those estimates; solid dots are real scale weigh-ins. Dashed curves show the 1,000 lb target pace, not a guessed final weight.